Spare parts. The silver tube is 18cm. The clamp has the large headed bolt and nut. The second bolt is included as an extra, there is no nut.
YAMAHA DTX Electronic Drum Cymbal Pad PCY155 Diameter Approx. 15.5 cm Black
Yamaha DTX Electronic Drum Kit - CYMBAL, PAD, MODULE, LOOM, HARDWARE, CLAMP
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Yamaha DTX Electronic Drum Kit - CLAMP